/// <summary>
/// 尝试搜寻目前局域网内的所有设备。
/// </summary>
/// <exception cref="TimeoutException">等待线程结束超时。</exception>
public void ScanForTarget()
{
// 获取当前设备
var device = DeviceList[CurDevName];
// 创建分析线程
const int analyzeThreadsCount = 4;
var analyzeThreads = new Thread[analyzeThreadsCount];
for (var i = 0; i < analyzeThreadsCount; i++)
{
analyzeThreads[i] = new Thread(ScanPacketAnalyzeThread);
}
// 创建发包线程队列
var sendThreads = new List <Thread>();
try {
// arp头起始位置向后偏移6字节后，取2字节内容即为arp包类型
device = StartCapture("arp [6:2] = 2");
// 启动分析线程
for (var i = 0; i < analyzeThreadsCount; i++)
{
analyzeThreads[i].Start();
}
// 去除网络号和广播地址，产生地址集合
byte[] minAddress = NetworkNumber.GetAddressBytes(),
maxAddress = BroadcastAddress.GetAddressBytes(),
tempAddress = minAddress;
var ipAddresses = new List <IPAddress>();
tempAddress[3]++;
while (!(tempAddress[0] == maxAddress[0] &&
tempAddress[1] == maxAddress[1] &&
tempAddress[2] == maxAddress[2] &&
tempAddress[3] == maxAddress[3]))
{
ipAddresses.Add(new IPAddress(tempAddress));
if (ipAddresses.Count >= (AddressCount / 8 >= 254 ? 254 : AddressCount / 8))
{
// 创建发包线程
var sendThread = new Thread(ScanPacketSendThread);
sendThread.Start(ipAddresses);
sendThreads.Add(sendThread);
ipAddresses = new List <IPAddress>();
}
var i = 3;
while (i >= 0 && tempAddress[i] == 255)
{
tempAddress[i] = 0;
i--;
}
tempAddress[i]++;
}
// 最后一个发送线程
var lastSendThread = new Thread(ScanPacketSendThread);
lastSendThread.Start(ipAddresses);
sendThreads.Add(lastSendThread);
// 等待数据包发送完成
new WaitTimeoutChecker((int)(60 * 1000 * Math.Log(AddressCount, 254))).ThreadSleep(500, () => sendThreads.Any(item => item.IsAlive));
// 等待接收目标机反馈消息
Thread.Sleep((int)(8 * 1000 * Math.Log(AddressCount, 254)));
}
finally {
// 终止发包线程
foreach (var sendThread in sendThreads)
{
if (sendThread.IsAlive)
{
sendThread.Abort();
}
}
// 终止分析线程
foreach (var analyzeThread in analyzeThreads)
{
if (analyzeThread.IsAlive)
{
analyzeThread.Abort();
}
}
// 清理缓冲区及其他内容
lock (_hostList) {
_hostList.Sort(Host.SortMethod);
}
StopCapture(device);
ClearCaptures();
}
}
public override void WriteTo(System.IO.Stream stream)
{
stream.WriteByte(4);
BinaryHelper.Write(stream, BroadcastAddress.GetAddressBytes());
}